What operating system do you use? Are you writing barebones code or programming applications running on an OS?
– Gilles 'SO- stop being evil'May 2 '15 at 12:30

See... I will explain in detail... To start with, I wanna run the ADC at 4MHz and then send the sampled data at that speed through USB to a software in my Windows Laptop...
– Suhel ChakrabortyMay 2 '15 at 12:44

1 Answer
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I'm using Keil and AFAIK Lite version can be used freely with 32kB code limitation. Last I've checked other commercial environments (e.g. IAR) are similar, that is there is some limited version with no cost.

Since LPCXpresso would be IDE used for sample projects from NXP I would stick with it, unless there are multiple project files available (for STM32 samples there are usually IDE project files for 4-5 different environments included).